Fuel mixer



April 22, 1930. w. A. EDWARDS FUEL MIXER Original Filed Sept 20, 1924 Patented Apr, 22, 1930 I 1 WIIzIiIAlVLApEDWARDS,

or:ortroi leo,irnnmols V I s re 'M'I' IYE R 1o throttleand running with'o pen' throttle'at high speed andunder load. It consists in the e'lern'e'nts *and I features of coi'istruction shown "and -'cles(':riloecl "as indicated-in the claims. V rnwhe' mwm sz 1 I I Figure l isadiagrainm'atic viewof amotor vehicle "having its 'engi'n'e-T equipped with a I device embodying this invention.

Figure 2is 'arsection at the-1ine2;2 on Fig- 7 i ure1,fheingaxial 'witl1re'spectto thefuelinixturecon'duit which leads to'ftl'ie 'engin'e intake. Figure :is a section at the l -ine"-3'i'8 on Figure Q. '7 I In the drawings th'e engine-iritake is in-dioated atth'e intake manifoldjln 2i'rep'res'ents the-main"fuelsupply tank"atthe reari ofsthe vehicle and at 'lowx level with respect ltOftll',

engine intake. 3 th'e'fuel' ductF-leadingtirom I the main tank to the float': bowl "or constant I level chamber, 4; or the fuel-mixture forming apparatus 'of thergeneral character of a carbureter. '5 iis'the fli'elmi xture conduit extend-ingEbetwen the new; "bowl, 4; and the intake manifold. The customary parts for vap ori'iingTtlieljorima-ry 'iii-iiture and affording additional air supply and for-throttle congtrol are conventionally shown, requiring no description for the purpose of the present invention. I r The part of the construction in which the characteristic of the present invention is contained is a Venturi construction in" the fuel mixture conduit which is shown at A closely adjacent to the float bowl, 4, and therefore, in the construction as indicated in the diagrammatic View of Figure 1, at a low level With respect to the engine intake. This Venturi device comprises a greater venturi, 7, having air' inlet at 7 a and constriction at 7 Inthis greater venturithere is located and afiro. rag-W3. new aii'd nus sh ment-n area" Serial moi-152,368. J

formed alesser reactor, 8, "which is par axi-al with the greater venture; but "ocean ie I with respect thereto, the roximate walls 'o'f 'tl'i'e two venmris merging I constrijctioi'i of the 'l'esser 'vent'u-ri is anterio'r, I along the 'a'ir pa-th through the two 'venturis, to the constrictioi'i of the greaterve11turi.- The terminal bfthe" fuehtlu'ct-is torrned' 'o'nfa nozzle, 1O,'for "W-hic'h a *boreeis nia'de 't'ihrough the adjacent and-combined "Walls of the -t Wo venturis approximately "at the tr"ansve1-se plane-of the con's' t'rietiono f the lesserjventuri, I said nozzle havi'rrg a lateral orifice, 10 for fuel delivery into thelesser venturi'anclf-having -its"-d"e'l'i'very into the; greater venturi at anori fice, 10," at its 'e'x' tr'e1nity,"said extremity being positioned substantially in "the axis of the greater a rentu'ri. I

The-operationof 'this construction is that under idling "conditions, the depression at the =constriction'otthe less'erx-venturiis adequate 'to supply "a limited quantity --"of 'relat-ively {rich mixtur'e through is'a'itl lesser :venturi, whichmingl'es withadditional-air drawn inthrough theigreater venturi arou'nrlthe discharge *'mouth "-ojf*theilesser; and i the de i ression at'the terminal orifice'ol't-he nozzle be coniesso muclr' le'ss tha'n 'at' the'constriction' of the lesser venturi that air is clrawnimthrough the"t'e-rminal orificeassisting in atomizingor dispersing the liquid in P the -initial mixture delivery from the' discharge'of th'e lesser venturi. il'Vith st-ill avideropening"of-the -th"r'(' t- 'tle and increase-=-of engine 'sp'eerh the depression at the constriction: ot-th'e lesser :ventur-i increases,causingsincrease of fuel drawn,'but greater increase of ain-drawn thr'ou gh -'loot'h the V'enturis and "up *to. a certain 12-point, incre'a'se' o'f' aij-r -di?aiwn -in through the? terminal I orifice, 10?, for: dispersingand iato'mizingthe W I oilati ts Ydelivery from thelesser Went-111 i. But as the air velocity 'a-n'cl:"consequent-"de' pression at theronstrictiomo'f the lesser venturi diminishes the increased depressions the-greater Fverituri at itheterminal orific'e, 95 10 of the nozzle causes ithe pressure atl that :pointto approach:V-that attheraor'ifice, roam the constriction of the! lesser vnturiiian'd air intake J through "the :terminal orifice,1'1053' of the noz'ile"'event-ually" ceases and :uponi' fur? in each other. .gE-The I that liquidfuel is discharged from the ter-- minal orifice, 10*, so that as stated, liquid fuel will flow out of both orifices, 10 and 10. Iclaim: 1. In a fuel mixture feeding apparatus, a fuel'mixture conduit comprising a greater Venturi passage and a lesser Venturi passage,

the lesser passage being positioned Wholly Within the greater andhaving its discharge mouth located proximate the plane of maxi mum depression ofsaid greater venturi; a continuous fuel supply duct extending for discharge into the lesser venturi substantially at the zone of greatest constriction of said lesser venturi and continued therebeyond for discharge in the greater venturi at a zone of the latter of substantially less than maximum depression. I 2. In a fuel mixture feeding apparatus, a fuel mixture conduit comprising a greater Venturi passage and a lesser Venturi passage, the lesser passage being positioned Wholly Within the greater and having its discharge mouth located proximate the plane of maximum depression of said greater venturi; a continuous fuel supply duct extending for discharge intothe lesser venturi substantially at the zone of greatest constriction of said lesser venturi and continued therebeyond for discharge in the greater venturiat azone of the latter a substantial distance anterior to the zone of maximum constrictionthereof- 3. Ina fuel mixture feeding apparatus, a fuel mixture conduit comprisinga greater Venturi passage and a lesser Venturi passage, the lesser passage being positioned wholly within the greater and having-its discharge mouth located proximate the plane of-maximum depression of said greater venturi; a continuous fuel supply duct extending for discharge into the lesser venturi substantially at the zone of greatest constriction of said lesser venturi and continued therebeyond for discharge in the greater venturi at a point relatively distant from the inner surface and proximate the axis thereof. V

, 4. In a fuel mixture feeding apparatus, a fuel mixture conduit comprising a greater Venturi passage and a lesser Venturi passage,

the lesserpassage being positioned Wholly Within the greater and having its discharge mouth located proximate the plane of maximum depression of said greater venturi;. a continuous fuel supply duct extending for discharge into the lesser venturi substantially at the zone of greatest constriction of said lesser venturi and continued therebeyond for discharge in the greater venturi at a zone of the latter at Which the depression is substantially less than the maximum and at a point relatively distant from the inner surface and proximate to the axis of said greater venturi.

- 5. In a fuel mixture feeding apparatus, a fuel mixture conduit comprising a greater Venturi passage and a lesser Venturi passage, the lesser passage being positioned Wholly within the greater and-having its discharge mouth located proximate the plane of maxi-. nmnrdepression of said greater venturi; a continuous fuel supply duct extending for discharge into the lesser venturi substantially atthe zone of greatest constriction of said lesser venturi and continued therebeyond for discharge in the greater venturi proximate to the axis of the latter at a zone thereof Which is at a substantial distance anterior to the zone of greatest constriction and to the zone of greatest depression, the lesser venturi being positioned eccentrically within the greater and being diametered for leavin the greater venturi unobstructed by the esser at a longitudinalpath proximate the axis of the greater venturi, for permitting the last mentioned fuel discharge proximate said axis.

6. In a fuel mixture feeding apparatus, a fuel mixture conduit comprising a greater Venturi passage and a lesser Venturi passage, the lesser passage being positioned Wholly Within the greater and having its discharge mouth located proximate the plane'of maximum depression of said greater venturi; a continuous fuel supply ductextending for discharge into the lesser venturi substantially at the zone of greatest constriction of said lesser venturi and continuous therebeyond for discharge in the greater venturi at a zone of i the latter of substantially less than maximum depression and a substantial distance anterior to the zone of maximum constriction thereof. In testimony whereof, I have hereunto set my hand'at Chicago, Illinois, this 80th day of November, 1926. I

WILLIAM A. EDWVAR-DS. 

